Originally Posted By gregsdart
Originally Posted By CMcAllister
Actually I read a story that said Mopar made the aluminum block a replacement part, accepted by NHRA, because all the iron blocks were only available as a long block assembly.

Much more likely it was as much or more ring seal as anything. If i recall correctly, Chuck said he picked up two tenths plus from that alone.


I wonder if the 6.4 truck block would be better than the 6.1 in ring seal?
Matt